Any forged alloy wheel be better than a steel wheel, due to better integrity and less weight. Also, larger rims are generally wider, which yeilds more contact patch, which is generally good.
Octane. You won't notice a difference in performance unless the car has a high compression ratio. Putting 89 into a high compression engine can cause detonation, which results in loss of power. Ergo, higher ocrane is used. For cars with knock sensors, it isn't as big of a deal, as the computer can control the fuel to prevent detonation. However, with higher octane the risk is less, allowing the engine to run unhampered, which would in theory allow for more continuous power.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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